JP2945874B2 - Manufacturing method of laminated film for UV cut - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a packaging bag for enclosing perishable products such as food, and a method for producing the same.

[0002]

2. Description of the Related Art Conventionally, packaging bags for enclosing meat and the like, especially living organisms and colored foods in foods, have conventionally been used to oxidize and discolor the contents.
In order to prevent deterioration of quality due to deterioration or the like, as shown in the enlarged cross section of FIG. 2, polyester, nylon, which is processed to reduce gas permeability so as to reduce oxygen permeability and water vapor permeability, A plastic substrate 1 such as polypropylene is used as a matrix, and a special substrate for preventing ultraviolet rays is laminated by extrusion lamination or dry lamination, or the surface of the plastic substrate 1 having an aluminum vapor-deposited layer 2 And a polyethylene layer 3 was laminated thereon.

In this case, an appropriate printing 4 is applied to the inner surface (laminated surface side) of the plastic base material 1 before laminating the polyethylene in order to clearly indicate contents and other necessary items as a product, and finally, a polyethylene layer is formed. By laminating No. 3, a construction method by heat bonding at the time of bag making is enabled.

[0004] In the case of using a film having an aluminum vapor deposited layer 2 as a substrate for the purpose of preventing ultraviolet rays, since the content of this substrate is difficult to see visually, as shown in FIG. The window 2a is opened so that it can be partially confirmed. As this method, a portion other than the window 2a may be subjected to paster processing for performing special printing to provide the portion of the window 2a, and the unprinted window portion may be removed using a special solvent.

As another means, aluminum is vapor-deposited on one surface of a biaxially stretched ethylene-vinyl alcohol copolymer film substrate, and a water-resistant lacquer is applied on the other surface to make the surface water-resistant, and the aluminum-deposited surface is coated with aluminum. Has been manufactured by laminating a polypropylene film and laminating a polyethylene film on the water-resistant surface.

[0006]

The method of manufacturing a packaging base material having the above-described structure is based on laminating a film having an aluminum vapor-deposited layer 2 for the purpose of cutting off ultraviolet rays on one side of the base material or a special film. In this case, an extrusion laminating step is required, and the processing step becomes complicated.
In addition, a film provided with the aluminum vapor-deposited layer 2 or a special film for the purpose of cutting off ultraviolet rays has a high price and a high manufacturing cost.

Further, in a packaging bag for enclosing a food or the like, there is a strong demand that not only oxygen permeability and water vapor permeability be reduced as much as possible, but also that the enclosed contents be sufficiently visible from the outside. Have been.

As a measure that can be visually observed without impairing the permeability of oxygen or water vapor, a method of removing the aluminum vapor-deposited layer 2 in a pattern at present is adopted. Is impossible.

However, even in such a method, there is no attempt to cut off ultraviolet rays entering from the transparent portion of the pattern.

[0010] The present invention solves the above-mentioned problems, and provides a method for producing an ultraviolet ray-preventing base material capable of easily observing the contents and preventing ultraviolet rays, and a food packaging bag using the same. The task is to

[0011]

In order to solve the above-mentioned problems, an anchor coating solution mixed with an ultraviolet ray-cutting agent is applied to one surface of a biaxially stretched plastic substrate, and extrusion coating or dry coating is performed on the application surface. It is obtained by bonding a laminated material of polyethylene into a transparent film using a laminating apparatus or the like.

Incidentally, polyester, nylon, polypropylene or the like is used as the plastic substrate.

[0013]

FIG. 1 is an enlarged sectional view of a bag-making film according to the present invention. FIG. 1 shows one side (packing) of a layer of polyester, nylon, polypropylene or the like which is a plastic substrate 1 of a biaxially stretched packaging bag. A stabilizer for polyurethane resin as an ultraviolet-cutting agent in an alkyl titanate or polyethyleneimine adhesion promoter as an anchor coat layer 6 used when laminating a polyethylene layer 3 for heat bonding at the time of bag making on the inner side of the bag) HN-130 was mixed and used to form a laminate film 5.

In this case, HN-1 which is an ultraviolet ray cut material is used.
Since 30 is a transparent body, the laminate film 5 is also transparent, and the contents are completely visible even when it is made into a packaging bag. The necessary printing may be performed on the inner side of the plastic substrate 1 (the inner side of the packaging bag) before lamination.

[0015]

As described above, since the entire surface of the ultraviolet-cut laminate film formed by the above-described method is transparent, the visual inspection of the contents is sufficient even if the surface is printed.

[0016] The simplest process, that is, the UV-cutting agent is applied to the plastic base material, except that a step of mixing the UV-cutting agent with the anchor coating agent for forming the anchor coat layer is added. A material that can be made into a bag can be obtained simply by applying an anchor coating agent containing the same and laminating a polyethylene layer serving as an adhesive surface.

As a result, it is possible to drastically reduce the cost of the ultraviolet-cut laminate film.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of an ultraviolet-cut laminate film according to the method of the present invention.

FIG. 2 is a cross-sectional view of a conventional bag-making film.

FIG. 3 is an explanatory view of an example of a film made visible with a conventional bag-making film.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Plastic base material 2 Aluminum vapor deposition layer 3 Polyethylene layer 4 Printing 5 Laminating film 6 Anchor coat layer containing an ultraviolet cut agent

Claims (2)

(57) [Claims] A biaxially stretched plastic base material is coated on one side with an anchor coat liquid mixed with an ultraviolet ray cut agent, and the coated side is formed into a transparent film by extrusion lamination or a dry lamination apparatus. A method for producing a laminated film for ultraviolet cut, characterized in that the laminated film is laminated. 2. The method for producing a laminated film for ultraviolet cut according to claim 1, wherein polyester, nylon, polypropylene or the like processed to reduce gas permeability is used as said plastic substrate.